C_beta = Atom('CH2')
H_gamma = Atom('H')
S_gamma = Atom('S')
bonds = [Bond(S_gamma, C_beta), Bond(H_gamma, S_gamma), ]
pdbmap = [('CYS', { 'HG': H_gamma, 'SG': S_gamma, 'CB': C_beta, }, ), ]
pdb_alternative = {'HG1': 'HG', 'HB1': '3HB', }
opls_atom_type = { C_beta: 'C2', S_gamma: 'SH', H_gamma: 'HS', }
opls_charge = { C_beta: .18, S_gamma: -.45, H_gamma: .27, }
name = 'cys_sidechain'
